Incandescent lamp or similar article



Nov. 17, 1931. P. A. CAMPBELL INCANDESCENT LAMP OR SIMILAR ARTICLE FiledMarch 17, 1927 fiv'mzv TUE; PER 5y .13. Liz MPEELZJQ 22'' P? /A .H'rs'ATTURNEZZI'Z Patented Nov. 17, 1931 UNITED STATES PATENT OFFICE PERCY A.CAMPBELL, OF EAST CLEVELAND, OHIO, ASSIGNOR TO GENERAL ELECTRIC COMPANY,A CORPORATION OF NEW YORK INCANIDESCENT LAMB SIMILAR ARTICLE Applicationfiled March 17, 1927. Serial "No. 176,225.

My invention relates to electric incandescent lamps and similar deviceswhich comprise a filament supported within a bulb or other container.More particularly, my invention relates to devices of that characterwhich are subjected during use to forces causing considerable vibrationof the filament and its supports. The object of my invention is torender the filaments of such devices less responsive to forces tendingto their maximum amplitude of vibration at their free ends and acomparatively small amplitude at the points of engagement with saidfilament.

In the modification shown in Figs. 3 and +1, a somewhat similar effectis secured by weighting the leading-in supports adjacent to the pointsof engagement with the filament. Pieces of metal such as nickel areunited as by welding to the leading-in sup- H) cau vibration thereof,ports which are usually of nickel. The ef- According to my inventionmeans are profe-"t is to deaden the vibration which would vided forreducing the amplitude of vibraordinarily occur at these points. Asshown, tion at the points of engagement of the leadthese points are nearthe end of the leading ing'in and other supports with the filament. 1nsupports.

" This may be accomplished, for example, by lVhat I claim as new anddesire to secure making said points of engagement intermeby LettersPatent of the United States, is: diate rather than end points of thesaid sup- A filament assembly for an incandescent ports, by weightingsaid points in some way lamp including a filament substantially in or bya combination of such methods. The a plane at right angles to the axisof the 7 efi'ect is to make nodes of said points or at least to maketheir amplitude of vibration much less than if they were at the ends ofthe supports or if the supports were unweighted. I

In the drawings, Fig. 1 is an elevation of an electric incandescent lampembodying one form of my invention; Fig. 2 is an elevation at rightangles to that of Fig. 1; Fig. 3 0 is a fragmentary elevation; and Fig.4 is an elevation at right angles thereto of a modification.

The incandescent lamp shown in Figs. 1 and 2 comprises the glass bulb 10within which is supported a filament mount comprising a glass stem 11, acentral glass rod 12, and the leading-in conductors 13 which are sealedat 14 in the stem 11 and are electrically connected to leading-insupports 15 7 each having one end embedded in the stem the leading-inand other supports will have lamp, astem and a plurality of combinedleading-in conductors and filament engaging supports extending from saidstem, the free ends of said supports each projecting beyond the point ofengagement with said filament to damp the vibrations oi the filament. Inwitness whereof, I hare hereunto set my hand this 15th day of lllarch.1927,

PERCY A. (ll lliBELL.

